It does take a bit of practice for sure. I've made about 20 batches now and just started getting it fluid enough for swirls about 4 batches back ... so for me, it was about 15 batches to get it right for swirls and another 5 to cook it quickly.
This thread has some great tips: https://www.soapmakingforum.com/threads/hp-tips.75192/
This thread has some great tips: https://www.soapmakingforum.com/threads/hp-tips.75192/